164256661293 has 4 divisors (see below), whose sum is σ = 219008881728. Its totient is φ = 109504440860.

The previous prime is 164256661267. The next prime is 164256661297. The reversal of 164256661293 is 392166652461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 392166652461 = 3 ⋅130722217487.

It is a cyclic number.

It is not a de Polignac number, because 164256661293 - 2³⁷ = 26817707821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164256661297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27376110213 + ... + 27376110218.

It is an arithmetic number, because the mean of its divisors is an integer number (54752220432).

Almost surely, 2^164256661293 is an apocalyptic number.

It is an amenable number.

164256661293 is a deficient number, since it is larger than the sum of its proper divisors (54752220435).

164256661293 is an equidigital number, since it uses as much as digits as its factorization.

164256661293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54752220434.

The product of its digits is 2799360, while the sum is 51.

The spelling of 164256661293 in words is "one hundred sixty-four billion, two hundred fifty-six million, six hundred sixty-one thousand, two hundred ninety-three".